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Re^3: "use encoding" behaviour change under Perl 5.10?

by diotalevi (Canon)
on Mar 25, 2009 at 15:37 UTC ( #753159=note: print w/replies, xml ) Need Help??

in reply to Re^2: "use encoding" behaviour change under Perl 5.10?
in thread "use encoding" behaviour change under Perl 5.10?

You've got another problem. Your browser incorrectly passed the ę character as %C4%88 that is, as a string which happens to be UTF-8 but should have passed it as %u0119. You've got to *guess* during your URL parsing if someone has started passing you a byte-string which happens to look like a UTF-8 string and if so, reinterpret it as UTF-8 instead. If you're being fully careful, you should also be using the Content-Type of the HTTP header your server sends, the client sends, and the HTML content encoding you sent when generating your page.

Here's what I use.

sub uri_unescape { my $to_decode = shift; return if ! defined $to_decode; $to_decode =~ s/\+/ /g; # A "good enough" check to see if the browser encoded high bit # characters as UTF-8 by looking for something that resembles a # URL-encoded utf8 octet series # # utf8 encoding starts with 11xxxxxx in the first byte and # 10xxxxxx in the subsequent bytes # my $is_byte_encoded_utf8 = $to_decode =~ /%[c-fC-F][[:xdigit:]]%[8 +9abAB][[:xdigit:]]/; $to_decode =~ s/%([[:xdigit:]]{2})/chr hex "0x$1"/eg; # Decode the "UTF-8" if it looked like it was such. If I enter # this block, the string may now be UTF-8 encoded as a perl # string. if ($is_byte_encoded_utf8) { $to_decode = Encode::decode( 'utf8', $to_decode ); } # Promote %uXXXX escapes up to characters. This is after the # Encode call so I don't inadvertently cause a promotion to utf8 # and then ask Encode to do another promotion. $to_decode =~ s/%u([[:xdigit:]]{4})/chr hex "0x$1"/eg; return $to_decode; }

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